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There are valid acute studies available for three trophic levels for Reaction mass of ammonium diaqua[bis(oxalate)]oxoniobate(1-) hydrate and ammonium hydrogen oxalate oxalic acid (1:1:1) dihydrate. No toxic effects occurred up to the highest test substance concentration for fish and Daphnia. For algae adverse effects were observed with an ErC50 (72h) of 21.1 mg/L and a NOErC of 0.352 mg/L (measured, geometric mean). The complex chemical nature of the test substance resulted in difficulties with regard to its chemical recovery. Although initial recovery rates were sufficient, the test substance precipitated in algae and Daphnia tests with time which is assumed to be the effect of chemical reactions between the individual dissociation products of Reaction mass of ammonium diaqua[bis(oxalate)]oxoniobate(1-) hydrate and ammonium hydrogen oxalate oxalic acid (1:1:1) dihydrate and ions of the test water (especially calcium). It was therefore considered to be appropriate to relate effect concentrations as geometric mean.

There are no tests available for chronic aquatic toxicity (on fish and aquatic invertebrates). However, in accordance with Regulation (EC) No 1907/2006, Column 2 of Annex IX, section 9.1.6 long-term toxicity tests on aquatic invertebrates and fish does not need to be investigated if the outcome of the chemical safety assessment shows no indication of risk on aquatic organisms from exposure to the substance in question. In a first step, the PNEC for the aquatic environment has been derived from tests on short-term toxicity using an appropriate assessment factor. The risk characterization ratio (RCR) has demonstrated that there is no indication of risk i.e. PEC/PNEC freshwater < 1 from current exposure conditions to Reaction mass of ammonium diaqua[bis(oxalate)]oxoniobate(1-) hydrate and ammonium hydrogen oxalate oxalic acid (1:1:1) dihydrate. Therefore, as the RCR freshwater is < 1 no further effects on aquatic organisms need to be investigated. Furthermore, acute toxicity tests on Reaction mass of ammonium diaqua[bis(oxalate)]oxoniobate(1-) hydrate and ammonium hydrogen oxalate oxalic acid (1:1:1) dihydrate revealed algae to be the most sensitive species.

A test on the toxicity to activated sludge is available for this substance (OECD 209) with no observed effects at 100 mg/L (nominal) on respiration. Therefore, the inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.